Why use half-duplex radios?

[WelshZeCorgi]

So I RIO using SRS and started learning a bit more about radios, and While the intercom allows simultaneous talk and hearing for pilot rio comms, the half-duplex radio does not do that. I was wondering why the decision was made to use a half-duplex radio instead of duplex, cause I feel like it would eliminate the instances of people accidently talking over each other if they did. 

[Zius]

Not a specialist by any means, but perhaps this is interesting:

https://www.rfwireless-world.com/Terminology/Half-duplex-radio-vs-Full-duplex-radio.html